Chapter 9, part 4—
insert—
'This part applies if an authorised person is satisfied on reasonable grounds that an emergency exists.
'An emergency exists if—
(a) either—
(i) human health or safety is threatened; or
(ii) serious or material environmental harm has been or is likely to be caused; and
(b) urgent action is necessary to—
(i) protect the health or safety of persons; or
(ii) prevent or minimise the harm; or
(iii) rehabilitate or restore the environment because of the harm.'.